Question: Who is the{SCO summit} for {participant of} of {Alexander Lukashenko}
Paraphrase: Who is the{SCO summit} for {member of} of {Alexander Lukashenko}
SPARQL (Wikidata):  select distinct ?obj where { wd:Q2866 wdt:P1344 ?obj . ?obj wdt:P31 wd:Q30178840 } 
Answer: 2017 SCO Summit, 2018 SCO Summit